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Re: [ecf-dev] OSGI Remote Services And Whiteboard Pattern
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On 5/7/2014 9:48 AM, Wim Jongman wrote:
If you keep the fallacies of distributed computing in mind [1] then
the "Whiteboard Pattern" (don't call me, I call you) works just fine
for remote services.
IMHO the dynamic nature of remote services are almost per definition
suitable for the "Whiteboard Pattern".
[1] http://en.wikipedia.org/wiki/Fallacies_of_Distributed_Computing
Sure...I certainly agree with Wim that the dynamic nature of OSGi remote
services make it very well suited for building distributed
systems...with the whiteboard pattern or not. I hope I haven't conveyed
otherwise...as it wasn't at all my intention to do so.
But IMHO 'keeping the fallacies of distributed computing in mind' can be
a very...sometimes overly...complex thing to do...especially when you
are talking about run-time behaviors associated with distributed
systems...e.g. problems associated with timing and reliability/partial
failure (e.g. distributed consensus [1]).
To me, this means that even with the wonderful OSGi service registry,
remote services...and the supported dynamics...there is/will always be
room for additional...complementary IMHO...models....like pub/sub/group
models...to help app/system builders deal with the problems in
distributed systems. An example: weak failure detectors for dealing
with partial failure. Like many things, I don't think this is a 'one
model will fit all application needs' situation.
Scott
[1] http://en.wikipedia.org/wiki/Consensus_(computer_science)
